Apparatus for reducing the expansion of fluids



May 81 1945- J. M. n. Giossn 2,375,646

u APPARATUS FOR REDUCING'THE EXPANSION 0F FLUIDS Filed Feb". 25, 194s 2 sheets-snm 2 IN VEN TOR.

I `Patented May 8, 1945 i mrrnnnroszroa neuronal-sarna. i `EXPANSION 0F FLUIDS JbseMariaDoniingo Grossuenos Aires.

p Argentina i Application lebruary,` 25, 1943;..SeralNoi 4:7li15l i lin Argentina January 16,1943

` pzclai'ms'.. (or. Iscr-rr) .'llhis.` invention refers.. to: a new: apparatushavingffonits `objectfwto produce a reduction ori the expansion: of the fluids, which apparatus. is panticularly. intended for substituting the valve-presently used: in. electric refrigerators. and'. other refrigerating apparatuses, for controlling .thefeeds ing of the freezing fiuid, whichvalve` is placed between the feeding source thercofsanol the'ireezu ingcoil.4 'i i rlllhe` Various. types 1 off value usedfupito the f presanV accident. which generally destroysn the vjoints orthe valves; i

The above# and otherI troubles. Well known to thoseslnilledr in. theA antare readily ouercome with theiusef offthe apparatus forming. the subject. matter of' this invention; There is no metallicebellows, neither springscomprised in. it; there isfno thermostatic bulb: or regulating needles forthe passage f off the; refrigeratingAV fluid; parts. that. are

entfor the purpose; despite that their working issatisfactory, considered"` ini al general way,xcomr Y p rise` such. complicated devices thatnvery: easily 1 getV out` of; proper working conditions and. require tofbe, repaired atJ short intervals` or; somev of:` the parts replaced owing-to. breakage or, excessiye wear. One, example that confirms. theaboye always subject to wearing out and.breakage.4 i

The@ apparatus is constituted; by two tubular parttsglonly,` one inside thegother; itbeing'itsown `particular and. constructive novel4 features that willl behereinafter `.fully described, which enable the apparatusf to.- advantageously substitute the existing valves. botlr `on the.` technical.' and@ econnmicaligrounds.`

statement is the metallic bellows with;` whichthe existing: valves are` provided; a part;v thanvcry readily breaksv down.: `anci-` causesleakage ofigthe refrigeratinguuid;A they also. comprise springs which, `upon suffering` any minimum alteration, fail toproperly control the passageoi?` the rcfrige `erating1fluid.throughthe` valve andthus cause` a variation on the normal distribution irrzthe` freeze inggcoil.` 3

i Another troublewithtlfie` existing valvesrresides in the.factthejtu they areprovidedwith a thermo- 'llhe installationi off the apparatus; isvery simple and can` befcarriedi out: in. a. very]` short?. time;

It requires only!" twoi connections.; one l for` admis y sion.` andir the` other" ton disclfiarge.Y The existing valves require, somee oiT/thennup to: iiveconncce' i from thegsourcethat.feedsit,.1andthenefore,when

The apparatusisprovided` with a chambenror cooling the liquid. refrigeratingr iiuid that..`arrives the liquid afterwards passes through! the: expanr sion reducing spiral... there takes: place;` afallr on static bulb connected with the exitJ endi'off the freezing coil,` and when the compressor is started theleisva delay-of" some minutesbefore. the freezing f the exit end of the coil connected to the bulb takes place; it happens in the meantime that the bulb allows a `certain amount of the refrigerating 'fluid to pass, a` `failure that sometime causes the pressure to be raised verymuch above the normal and in many cases there result serious damages to the valve and even to the compressor.

.i There is already `in use a type of valve which is provided with a long pipe `of small diameter,

wound in the shape of a spira-l, intended to produce a. reduction of the expansion of the refrigerating fluid. The veryserious trouble with this type ofvalve is, that owing to the various technical reasons which prevent it, the pipe cannot be opened for thoroughly cleaning the incrustations which tend to seal it, and this `failure causes a` great drawback on the operation of the refrigerl ating apparatus. Sometimes the operation thereof is stopped thereby.

Finally, the operation of every known valve offers the risk of permitting a return of the rey l frigerating fluid to the compressor with the corresponding danser of blows delivered by the pistons against the head of the compressor cylinders,

side thereof.

the` pressure Q therrefrigerator,4 an arrangement N that affords the maximum output,

. Itis to be noted: that, thee apparatus.. can; be

employed in` refrigerators'. or the.r like provided with automatic control, furthe temperature; as

well as in those refrigerators having a low pres-` sure automatic control.

As the apparatus does not comprise parts that are likely to be damaged or become destroyed, it will be evident that, besides its advantages as to low cost and eiiciency, it is of unlimited duration. It can be taken to pieces very easily whenf ever it is required and during the trials that have been made, its advantages have been made clearly evident.` p In order that the invention may beunderstood and easily carried into practice, a thereof will now be given with reference to the accompanying drawings wherein the same numerals of reference indicate similar or equivalent parts all through the various figures.

In the drawings: Fig. l is a view of the outside of the apparatus. Fig. 2 is a lengthwise section showing the in- Fig. 3 isa view of the tubular member `which forms the freezing chamber and the expansion ortica full description .fitted the other tubular member shown in Figure 3, so disposedtthat, when the latter is forced inside the former, the inner surface of the wrapper and the outer surface of the freezing chamber will form between them a long helical tube for reducing the expansion of the refrigerating fluid on its passage therethrough,

In the drawings it has been indicated with I the external wrapper Whose end 2 is open for4 receiving the other tubular member 3 which constitues the freezing chamber and the expansion reducing member.

The other end 4 of the wrapper I is also open for being connected to the freezing coil of the refrigerator or the like (not shown). For facilitating this connection, the end 4 is externally threaded as shown in 5 for receiving a nut 6.'

, The tubular member has its admission end 'I open. for being connected to the source that feeds the refrigerating iiuid; it is externallythreaded as shown in 8 and carries a nut Si. l

The other end or bottomg I of the tubular member 3 is closed and is provided with an external slot I I.

The numeral I2 indicates the freezing chamber Aformed in the interior ofthe tubular membei' 3, the chamber being provided at its upper part with an exhaust perforation or port vI3 placed near the admission opening thereof.

The external 'surface of the tubular member 3, starting at the exit opening I3 and up to the closed end Ifcarries a helical slot 14? Which provides ka long tubular helical passage when the said member is fitted inside the wrapper I, through which passage circulates the refrigerating uid under reduced`expansion.

A metallic mesh filter I is placed within the admission end I of the tubular member 3 for preventing the entrance of anyforeign matter intothe chamber I2 and to settle therein, sealing at some point the slot I4.

The operation of the apparatus is readily appreciated in the above description and in the drawings. 4

However, -a brief description of same will be given hereafter, in order to rclear up any doubt that may eventually still remain.

After the apparatus has been connected, its admission 'I to the source feeding the refrigerating fiuid and the exit opening 4 to the freezing coil,l the compressor is started.

rf'he liquid refrigerating fluid penetrates through the admission ,'I and is strained by the filter I5. After leaving the filter it starts its travel through the freezing chamber I2 towards the exit I3 through which it goes out of the chamber, penetrating in the helical tubular passage formed by the slot I4, through which it travels under reduced expansion at a very low temperature and arrives at the end I0`where, passing through the slot II, comes to the exit end 4 of the apparatus and goes into the freezing coil.

It is to be clearly understood that despite the fact that this apparatus is particularly intended for being applied to refrigerating chambers, its use must not be considered as rlimited to that adaptation because, as it is apparent, other uses may be made thereof orbe adapted to other devices. Also, that inr carrying the invention into use, constructional details might be changed so far as the scope of the invention as' defined by the following claims is maintained.` i

What I claim is:

1. A device of the character described oomprising a tubular casing having an internal shoulder near one end thereof, a tubular liner telescoped within the casing abutting said shoulder and having a spiral groove in its periphery cooperating with the inner surface of the casing to vform a spiral passageway terminating 'at one end at said shoulder, a port extending lthrough the Wall of the liner and communicating with the opposite end of the spiral passageway', a'plug closing the end of the tubular linerrv whichv is adjacentv to the shoulder and provided with a groove placing one end of the spiral passageway in communication withv one end portion of the casing, and means at the opposite end of the tubular liner to facilitate the attachment of a pipe thereto. i

2. A device as claimed in claim 1, in which' a substantially cupped shape screen extends into the liner from the last-mentioned end thereof and terminates adjacent to said port.

JOSE MARIA DOMINGO GRossr. 

